You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application contains a composite user control that includes a TextBox control named txtInput. The user control will be hosted in a window and will have handlers for the text-changed event of txtInput. You need to ensure that the application meets the following requirements: Creates a text-changed event handler named Audit_TextChanged for the txtInput control. Executes Audit_TextChanged even when specific handlers mark the event as handled. Which code segment should you add to the constructor of the user control?（）

• A、txtInput.TextChanged+=Audit_TextChanged;
• B、AddHandler(TextBox.TextChangedEvent, new  RoutedEventHandler(Audit_TextChanged), true);
• C、EventManager.RegisterClassHandler(typeof(TextBox),  TextBox.TextChangedEvent, new  RoutedEventHandler(Audit_TextChanged), true);
• D、EventManager.RegisterClassHandler(typeof(TextBox),  TextBox.TextChangedEvent, new  RoutedEventHandler (Audit_TextChanged), false);